112 lines
1.9 KiB
Plaintext
112 lines
1.9 KiB
Plaintext
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#!/bin/sh
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. ../lib/common.sh
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cleanup()
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{
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umount "${tmpdir}/root" || :
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qemu-nbd -d /dev/nbd0 || :
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rm -rf "$tmpdir"
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}
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set -ef
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trap cleanup EXIT INT
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devmgr=${DEVMGR:-proc}
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arch=${ARCH:-$(uname -m)}
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kernel=${KERNEL:-$(uname -r)}
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vmlinuz=${VMLINUZ:-"/boot/vmlinuz-${kernel}"}
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mkdir -p "${tmpdir:=${TMPDIR:-/tmp}/${0##*/}.$$}"
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root="${tmpdir}/root"
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config="${tmpdir}/config"
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image="${tmpdir}/root.qcow2"
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initrd="${tmpdir}/initramfs-$(uname -r)"
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qemu-img create -f qcow2 "$image" 1G
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qemu-nbd -c /dev/nbd0 "$image"
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# o: Create MBR table.
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# n: Add new partition to table.
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# p: Primary partition.
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# 1: Partition number.
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# newline: Use default value for first sector.
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# newline: Use default value for last sector.
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# w: Write changes and re-read partition table.
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fdisk /dev/nbd0 << EOF
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o
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n
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p
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1
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w
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EOF
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cat > "$config" << EOF
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hooks=$devmgr
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root=LABEL=root
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EOF
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mkdir -p "$root"
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mkfs.ext4 -L root /dev/nbd0p1
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mount /dev/nbd0p1 "$root"
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(
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tmpdir=$root; cd "$tmpdir"
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mkdir -p \
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dev sys tmp run proc \
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root usr/lib usr/bin
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ln -s usr/lib lib
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ln -s usr/bin bin
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ln -s usr/bin sbin
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ln -s bin usr/sbin
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copy_exec sh
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copy_exec e2label
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cat > sbin/init << EOF
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#!/bin/sh
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exec e2label /dev/disk/by-label/root success
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EOF
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chmod +x sbin/init
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)
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umount "$root"
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qemu-nbd -d /dev/nbd0
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(cd .. && ./tinyramfs -lk "$kernel" -c "$config" "$initrd")
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set -- \
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-no-reboot \
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-initrd "$initrd" \
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-kernel "$vmlinuz" \
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-device virtio-scsi \
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-drive file="$image",if=virtio
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if [ -c /dev/kvm ]; then
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set -- -enable-kvm -cpu host "$@"
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fi
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if [ "$DEBUG" ]; then
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set -- -append 'panic=-1 rdpanic debug rddebug console=ttyS0' -nographic "$@"
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else
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set -- -append 'panic=-1 rdpanic' -display none "$@"
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fi
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"qemu-system-${arch}" "$@"
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qemu-nbd -c /dev/nbd0 "$image"
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# Re-read partition table.
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fdisk /dev/nbd0 << EOF
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w
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EOF
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[ "$(e2label /dev/nbd0p1)" = success ]
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